DDC3256 256-Channel, Current-Input Analog-To-Digital Converter

1 Features ? Single-chip solution to directly measure 256 lowlevel currents simultaneously ? Adjustable full-scale charge range up to 320 pC ? Input current: 1 μA (maximum) ? Adjustable speed with integration times as low as 50 μs (20 KSPS per channel) ? Resolution: 24 bit ? Low power diss

文件：614.07 Kbytes 頁(yè)數(shù)：9 Pages

TI

德州儀器

DDC3256 256-Channel, Current-Input Analog-To-Digital Converter

1 Features ? Single-chip solution to directly measure 256 lowlevel currents simultaneously ? Adjustable full-scale charge range up to 320 pC ? Input current: 1 μA (maximum) ? Adjustable speed with integration times as low as 50 μs (20 KSPS per channel) ? Resolution: 24 bit ? Low power diss

文件：581.82 Kbytes 頁(yè)數(shù)：9 Pages

TI

德州儀器

絲印：DDC3256；Package：NFBGA；DDC3256 256-Channel, Current-Input Analog-To-Digital Converter

1 Features ? Single-chip solution to directly measure 256 lowlevel currents simultaneously ? Adjustable full-scale charge range up to 320 pC ? Input current: 1 μA (maximum) ? Adjustable speed with integration times as low as 50 μs (20 KSPS per channel) ? Resolution: 24 bit ? Low power diss

文件：614.07 Kbytes 頁(yè)數(shù)：9 Pages

TI

德州儀器

絲?。?strong>DDC3256；Package：NFBGA；DDC3256 256-Channel, Current-Input Analog-To-Digital Converter

1 Features ? Single-chip solution to directly measure 256 lowlevel currents simultaneously ? Adjustable full-scale charge range up to 320 pC ? Input current: 1 μA (maximum) ? Adjustable speed with integration times as low as 50 μs (20 KSPS per channel) ? Resolution: 24 bit ? Low power diss

文件：581.82 Kbytes 頁(yè)數(shù)：9 Pages

TI

德州儀器

絲?。?strong>DDC3256；Package：NFBGA；DDC3256 256-Channel, Current-Input Analog-To-Digital Converter

1 Features ? Single-chip solution to directly measure 256 lowlevel currents simultaneously ? Adjustable full-scale charge range up to 320 pC ? Input current: 1 μA (maximum) ? Adjustable speed with integration times as low as 50 μs (20 KSPS per channel) ? Resolution: 24 bit ? Low power diss

文件：581.82 Kbytes 頁(yè)數(shù)：9 Pages

TI

德州儀器

256/512 通道 20kSPS 電流輸入模數(shù)轉(zhuǎn)換器

DDC3256 是一款 24 位、256 通道電流輸入模數(shù) (A/D) 轉(zhuǎn)換器。它結(jié)合了通過(guò)電流積分進(jìn)行的電流電壓轉(zhuǎn)換和模數(shù)轉(zhuǎn)換。\n\n光電二極管等多達(dá) 256 個(gè)獨(dú)立的低電平電流輸出器件可直接連接到其輸入并并行（同時(shí)）進(jìn)行數(shù)字化。\n\n對(duì)于全部 256 路輸入中的每一路，該器件都有一個(gè)低噪聲、低功耗積分器，專用于捕捉傳感器中的全部電荷。積分時(shí)間可在 50μs 至 1.6ms 范圍內(nèi)調(diào)整，從而能夠以出色的精度連續(xù)測(cè)量 fA 至 μA 級(jí)別的電流。積分器的輸出通過(guò)片上低功耗 ADC 進(jìn)行數(shù)字化，而轉(zhuǎn)換得到的數(shù)字代碼通過(guò)單個(gè) LVDS 對(duì)進(jìn)行傳輸，該 LVDS 對(duì)經(jīng)過(guò)設(shè)計(jì)，可盡可能地減少高通道 ? 單芯片解決方案，可同時(shí)直接測(cè)量 256 個(gè)低電平電流\n? 高達(dá) 320pC 的可調(diào)滿量程電荷范圍\n? 輸入電流：1μA（最大值）\n? 速度可調(diào)，積分時(shí)間低至 50μs（每通道 20KSPS）\n? 分辨率：24 位\n? 低功率損耗：1.2mW/通道\n? 積分非線性：±0.025%（滿量程范圍的 ±1ppm，所有通道均處于活動(dòng)狀態(tài)）\n? 低噪聲：0.26fCrms（320pC FSR 且傳感器電容為 20pF）\n? 無(wú)電荷損耗\n? 片上溫度傳感器\n? 串行 LVDS 輸出接口\n? 1.85-V 單電源\n? 封裝內(nèi)旁路電容器和基準(zhǔn)緩沖器可減小 PCB 面積并降低設(shè);

TI

德州儀器